，風(fēng)管應(yīng)盡可能按直線布置。
First of all, the wind pipe should be arranged in line as far as possible.
這一條要求對任何風(fēng)管系統(tǒng)的布置都是重要的準(zhǔn)則。直線布置的風(fēng)管系統(tǒng)，在運行能耗和初投資兩方面都是低的。從的觀點分析，空氣總是"希望"走直線，這將減少能耗。從費用的觀點分析，直管段的費用比各種彎頭等管件要少很多。所以，當(dāng)布置一個風(fēng)管系統(tǒng)的平面走向時，應(yīng)力圖將拐彎的數(shù)員減少。
This requirement is the most important criterion for any duct system layout. The linear layout of the duct system is the lowest in terms of operation energy consumption and initial investment in two aspects. From the point of view of energy conservation, air always "wants" to take a straight line, which will reduce energy consumption. From the point of view of cost, the cost of straight section is much less than that of fittings such as various elbows. Therefore, when the plane direction of an air duct system is arranged, the number of turns should be minimized.
其次，采用標(biāo)準(zhǔn)長度的直線管段，將各種變徑管和接頭的數(shù)量減少。直的、標(biāo)準(zhǔn)長度的風(fēng)管造價相對便宜，因為它們的加工費低，標(biāo)準(zhǔn)長度的直風(fēng)管，可按標(biāo)準(zhǔn)寬度的鋼板卷材在白動生產(chǎn)線上制作。而任何段非標(biāo)準(zhǔn)長度的矩形風(fēng)管，從技術(shù)上說，都可當(dāng)作配件，因為它們不可能用標(biāo)準(zhǔn)卷材做成。螺旋圓形風(fēng)管實際上可做成任意長度。橢圓形風(fēng)管的標(biāo)準(zhǔn)長度則完全取決于金屬加工廠的加工標(biāo)準(zhǔn)。有的設(shè)計者總是認為，在一個風(fēng)管系統(tǒng)平面設(shè)計中，頻繁地減小風(fēng)管斷面尺寸，似乎就可以減少一次投資。其實不然。
Secondly, the standard length straight pipe section is used to minimize the number of various diameter pipes and joints. Straight, standard length wind pipes are relatively cheap because their processing costs are low and the standard length of the straight wind pipe can be made on the white moving production line according to the standard width of the steel sheet. Any section of the non standard length rectangular duct can be used technically as an accessory, because they can not be made of standard coil material. The spiral air duct can actually be made at any length. The standard length of the elliptical duct depends entirely on the processing standard of the metalworking plant. Some designers always think that in a plane design of windpipe system, reducing the size of the duct section frequently seems to reduce one investment. In fact, it is not.
第三，只要安裝空間范圍允許，就建議采用螺旋圓風(fēng)管。
Third, as long as the installation space scope is allowed, we recommend the use of spiral air duct.
圓形風(fēng)管允許采用較高的風(fēng)速。仁義通風(fēng)介紹一個中型變風(fēng)量空調(diào)系統(tǒng)，其風(fēng)速可達20m/s，而一個大型變風(fēng)量寧調(diào)系統(tǒng)，其風(fēng)速則可高達30m/S。對矩形風(fēng)管的允許風(fēng)速則一般都較低，風(fēng)速過高容易引起扁平風(fēng)管壁的共振而產(chǎn)生噪聲，特別是會產(chǎn)生低頻噪聲并傳室內(nèi)。
The circular wind pipe allows for higher wind speed. Ren Yi ventilation introduces a medium VAV air conditioning system with a wind speed of 20m/s. A large VAV system can be as high as 30m/S. The allowable wind speed for the rectangular duct is generally low, and the high wind speed can easily cause the resonance of the flat wind tube wall to produce noise, especially the low frequency noise will be produced and spread to the room.
采用圓形風(fēng)管和較高的送風(fēng)速度，將可顯著地節(jié)省投資。，與類似的矩形風(fēng)管系統(tǒng)相比，圓形風(fēng)管系統(tǒng)將可節(jié)省15%一30%的薄鋼板。例如，同樣輸送17000m3/h的空氣，根據(jù)控制噪聲的要求，圓形風(fēng)管的風(fēng)速可取19m/s，矩形風(fēng)管則取10m/s，它們的鋼板消耗量比較可見表5-1。從表中可知，采用圓形風(fēng)管，可節(jié)約37％的薄鋼板。
The use of a circular duct and a higher air supply speed will significantly save investment. First, compared with a similar rectangular duct system, the round air duct system will save 15% or 30% of the thin steel plate. For example, the same air for transporting 17000m3/h, according to the requirement of controlling noise, the wind speed of the circular pipe is 19m/s, and the rectangle wind pipe is 10m/s, and the consumption of the steel plate is compared to the visible Table 5-1. From the table, we can see that using round air pipe can save 37% of thin steel plate.
后，圓形風(fēng)管的安裝費用低于矩形風(fēng)管。這是因為，圓形風(fēng)管本身結(jié)構(gòu)的剛性好，預(yù)制管段可以較長，現(xiàn)場安裝的工作量相對較少。圓形風(fēng)管的制作、連接都較矩形風(fēng)管嚴密，漏風(fēng)率大約為1%，而矩形風(fēng)管的漏風(fēng)率有時高達l0%，甚更高，為防止空氣滲漏，需要花去大量人力對每一矩形風(fēng)管進行檢漏和密封。
Finally, the installation cost of the circular duct is lower than that of the rectangular duct. This is because the rigid structure of the circular duct itself is good, the precast pipe section can be longer, and the workload of on-site installation is relatively small. The circular wind pipe is made and connected more closely than the rectangular wind pipe, the air leakage rate is about 1%, and the leakage rate of the rectangular duct is sometimes as high as l0%, even higher. In order to prevent air leakage, it is necessary to spend a lot of manpower to leak and seal each rectangular duct.
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